JPS58314Y2 - soldering equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to a soldering device. In particular, when wiring a discrete wire consisting of a signal wire and a ground wire, when branching the ends of the discrete wire and soldering each one, solder is applied from the branching point. The present invention relates to a means for calculating the distance to the attached terminal and soldering the longer distance first.

A method called reflow wire bonding is used to solder discrete wires to printed circuit boards used in electronic computers and the like.

The soldering device for this purpose melts the solder applied to the solder terminals of the printed circuit board with a soldering head that generates resistance heat, and can perform soldering without separately supplying solder.

On the other hand, the discrete wires to be wired are configured as a pair of ground wire and signal wire in order to prevent noise from entering the signal wire.

When connecting desired terminals with a signal line, simultaneously connect the ground terminals near the signal line terminals at both ends with this pair of ground wires.

Soldering work is performed in the following order.

(1) The soldering device branches the discrete wires,
Separate into signal line and ground line.

(2) The soldering head is moved to the position where one tip is to be soldered.

(3) The operator presses the tip of one discrete wire to be soldered onto the terminal surface, lowers the soldering head, and performs soldering.

(4) The soldering head is moved to the position where the other tip is to be soldered.

(5) When the operator presses the remaining tip of the discrete wire to be soldered onto the terminal surface, the soldering head is lowered to perform soldering.

(6) When the start end connection of the discrete wire is completed, the soldering head moves to the end position while feeding out the discrete wire.

(7) Soldering of the following ends is performed in the same process as force (0→5), and one discrete wiring is completed.

In the above process, the length of the branched discrete wire differs depending on the position of the soldering terminal, and especially if the terminal with a shorter distance from the branching point to the soldering terminal is soldered first, When soldering, the longer branch wire from the branch point to the soldering terminal may be pulled, or the shorter branch wire may be bent, which may cause noise between it and other soldered terminals. there were.

The purpose of this invention is to overcome the above drawbacks, and the purpose is to hold a printed board etc. equipped with wiring terminals, move the soldering head to a predetermined terminal position on the held printed board, and separately In a soldering device that branches the tip of the held discrete wire, transfers the branched tip of the discrete wire to the soldering head, and solders it to the terminal on the printed board, the soldering is performed from the branch point of the discrete wire. This is achieved by providing a distance comparison circuit that compares the distance to the attached terminal, and using this comparison circuit to solder the shorter branch wire first.

This idea will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a printed circuit board soldering apparatus based on this invention.

In Figure 1, PRT is the printed board, CNT is the wiring control section, WLC is the wire length command section, IPC is the soldering head position command section, WBH is the soldering head, H8B is the head support arm, and WRB is the winding support , DCW is a discrete line, and ALC is an arithmetic circuit based on two ideas.

In FIG. 1, the wiring control unit CNT controls the soldering head WB attached to the head support arm H8A according to the wiring order stored in the storage unit etc. by the head position command unit RPC.
To move H to a predetermined position on the printed circuit board PRT, solder the starting end of the discreet wire DCW with the soldering head WBH, and pull out the wiring conductor from the winding support WRB using the conductor length command unit WLC. The soldering head WBH is moved, the conductive wire is cut, and the end point of the conductive wire DCW is soldered again.

FIG. 2 is a block diagram of an embodiment of an arithmetic circuit based on this invention.

In Fig. 1, ALC is an arithmetic circuit added to the position command unit RPC of the soldering head at the start and end portions shown in the explanation of Fig. 1, and 5SREG and 5EREG are the signal line position and ground line position at the start end, respectively. coordinate register, ESRE
G and EEREG are coordinate registers for the signal line position and ground line position at the end, respectively, 5BREG and EBREG are coordinate registers for the start and end branch positions, respectively, ALU is a branch length calculation circuit, and LSREG and LEREG are registers for the signal line and ground line, respectively. The coordinate register COMP, which stores line branch points, is a comparison circuit.

In FIG. 2, the position command unit HPC inputs the coordinates of the signal line and the ground line at the starting end to be soldered to the coordinate register 5SRE.
G and the coordinates of the signal line and ground line at the end in coordinate register 5EREG and the branch positions of each start and end in coordinate register ESREG and coordinate register EEREG.
Send BREG, EBREG K.

Based on the values of the coordinate registers above, the arithmetic circuit ALU sets the distance between the branch point at the starting end of the conductor and the signal terminal in the branch length register LSREG, and calculates the distance between the branch point and the ground terminal by subtracting -6 from the starting end of the conductor as the branch length. Set it in the register LEREG, and compare the lengths of both in the comparison circuit COMP. If the value of the branch length register LSREG is longer, the code OO" is issued, and if the value of the branch length register LEREG is longer, the code O1' is issued. is sent to the position command unit RPC.

Based on this code, the position command unit RPC determines the positioning to the signal terminal first if it receives the code "00", and determines the positioning to the ground terminal first if it receives the code "01".

Similarly, when soldering the starting end of a discrete wire, when starting the soldering of the terminal end after the end, the arithmetic circuit ALC records the distance from the branch point at the end of the conductor wire to the signal terminal in the branch length register LSRE.
Enter the distance between the branch point and the ground terminal in branch length register L.
The comparison circuit COMP compares the lengths of the two, and if the value of the branch length register LSREG is longer, code 11'' is set. Send to command unit HPC.

Based on this code, the position command unit RPC determines the positioning of the signal terminal first if it receives the code 1 or 0", and determines the positioning of the ground terminal first if it receives the code 11".

The arithmetic circuit ALC that appeared in the above explanation can be implemented by a simple microprogram, and furthermore, it can be implemented by embedded software in a small computer.

As explained above, this idea calculates the distance from the branch point to each terminal when wiring discrete wires, and then solders the terminal with the longer distance first.
The short part from the branch point to the terminal can be cut freely according to the soldering position, and the excess wire will be bent on the printed board, which will not only reduce damage and breakage of the discrete wire due to this bending, but also This makes it possible to prevent signal reliability from deteriorating due to this extra bent discrete wire.

[Brief explanation of the drawing]

Figure 1 is a diagram of an embodiment of a discrete wire soldering device.
FIG. 2 is a block diagram of an embodiment of an arithmetic circuit based on this invention. Each symbol in FIGS. 1 and 2 represents the following. PRT...printed board, CNT...wiring control section, W
LC...Conductor length command section, RPC...Position command section, W
BH...Soldering head, H3A...Head support arm, WRB...Winding support part, DCW...Discrete wire, ALC...Arithmetic circuit, ALU...Branch length calculation circuit, 5SREG, 5EREG, FSREG, EER
EG...Coordinate register, LSREG, LGREG ・
...Coordinate register, COMP...Comparison circuit.

Claims (1)

[Scope of utility model registration request] Hold a printed board etc. equipped with wiring terminals, move the soldering head to a predetermined terminal position on the held printed board, branch the tip of the separately held discrete wire,
A soldering device that solders the tip of the branched discrete wire to a terminal on the printed circuit board using the soldering head includes an arithmetic circuit that calculates and compares the distance from the branch point of the discrete wire to the soldering terminal. A soldering device characterized by comprising: